Looking at the news site wouldn’t be a sin. And even if their content was monetized and they gave some of it to Planned Parenthood, the impact of your click on the total amount they give to PP would be negligible at best.
Most major corporations nowadays donate to morally questionable causes in some way or another. If we were to avoid every company that did that, we’d hardly be able to eat, use the internet or phones, or do much of anything else. The bigger issue with these sorts of things is not the financial, but more the optical. That is, the appearance of supporting evil leads others to sin. As an example, consider Starbucks. There’s a rumor that pops up occasionally online that says they give $15 million a year to Planned Parenthood. This isn’t actually true; they do employee gift matching, and so as a company don’t really donate to any one organization. They rather match whatever donations their employees make. So if an employee donates to PP, they match the donation. If an employee donates to his Catholic parish, they match that.
But let’s assume they did donate $15 million a year to Planned Parenthood, and you go there every day and have a $7 cup of coffee. In a year’s time, you’ve given Starbucks $2,555. Their annual revenue is somewhere in the neighborhood of $10 billion, of which your $2,555 is such a minute percentage as to be laughable. So your total contribution to their donation to Planned Parenthood winds up being about 3 cents.
Bottom line is, you didn’t contribute enough monetarily for it to matter. But let’s say you’re me, and you’re a priest, and your parishioners see you patronizing a business which is known for its very public stances on morally questionable causes. They might think “hey, Father is at Starbucks, it must be okay to believe x or y.” Scandal is the bigger issue with something like that.
More than what you were asking, but that’s roughly what’s at stake.
-Fr ACEGC